I was working on a job on changing out some outlets. I noticed that half of the outlets were black to brass and half were not. (I independently checked the black and it was the hot wire, while the white was the neutral.) Does it really matter? I have always done black(hot wire) to brass in my past. So when I got this job I was surprised it worked for all these years. The owner of this house said that the electrical hasn't been touched for over 20 years and he never had a problem.